/**
 * This jQuery plugin displays pagination links inside the selected elements.
 *
 * @author Gabriel Birke (birke *at* d-scribe *dot* de)
 * @version 1.2
 * @param {int} maxentries Number of entries to paginate
 * @param {Object} opts Several options (see README for documentation)
 * @return {Object} jQuery Object
 */
jQuery.fn.pagination = function(maxentries, opts){
	opts = jQuery.extend({
		items_per_page:10,
		num_display_entries:8,
		current_page:0,
		num_edge_entries:0,
		link_to:"javascript:void(0)",//liDuanqiang modify
		prev_text:"Prev",
		next_text:"Next",
		ellipse_text:"...",
		prev_show_always:true,
		next_show_always:true,
		show_entries_count:false,
		callback:function(){return false;},
		renderPagebarBefore:true
	},opts||{});
	
	return this.each(function() {
		/**
		 * Calculate the maximum number of pages
		 */
		function numPages() {
			return Math.ceil(maxentries/opts.items_per_page);
		}
		
		/**
		 * Calculate start and end point of pagination links depending on 
		 * current_page and num_display_entries.
		 * @return {Array}
		 */
		function getInterval()  {
			var ne_half = Math.ceil(opts.num_display_entries/2);
			var np = numPages();
			var upper_limit = np-opts.num_display_entries;
			var start = current_page>ne_half?Math.max(Math.min(current_page-ne_half, upper_limit), 0):0;
			var end = current_page>ne_half?Math.min(current_page+ne_half, np):Math.min(opts.num_display_entries, np);
			return [start,end];
		}
		
		/**
		 * This is the event handling function for the pagination links. 
		 * @param {int} page_id The new page number
		 */
		function pageSelected(page_id, evt){
			current_page = page_id;
			drawLinks();
			var continuePropagation = opts.callback(page_id, panel);
			if (!continuePropagation) {
				if (evt.stopPropagation) {
					evt.stopPropagation();
				}
				else {
					evt.cancelBubble = true;
				}
			}
			return continuePropagation;
		}
		
		/**
		 * This function inserts the pagination links into the container element
		 */
		function drawLinks() {
			panel.empty();
			//Show entries count
			if(opts.show_entries_count){
				panel.append($("<li style='font-size:14px;'><span>记录总数:&nbsp;"+maxentries+"条</span></li>"));
			}
			var interval = getInterval();
			var np = numPages();
			// This helper function returns a handler function that calls pageSelected with the right page_id
			var getClickHandler = function(page_id) {
				return function(evt){ return pageSelected(page_id,evt); };
			};
			// Helper function for generating a single link (or a span tag if it's the current page)
			var appendItem = function(page_id, appendopts){
				page_id = page_id<0?0:(page_id<np?page_id:np-1); // Normalize page id to sane value
				appendopts = jQuery.extend({text:page_id+1, classes:""}, appendopts||{});
				var lnk;
				if(page_id == current_page){
					//var lnk = jQuery("<span class='current'>"+(appendopts.text)+"</span>");
					//css to bootstrap by rocky on 2014-11-07
					lnk = jQuery('<li><a href="#">'+(appendopts.text)+'</a></li>');
					if(appendopts.classes){
						lnk.addClass('disabled');
					}else{
						lnk.addClass('active');
					}
				}
				else
				{
					//var lnk = jQuery("<a>"+(appendopts.text)+"</a>")
					lnk = jQuery('<li><a href="#">'+(appendopts.text)+'</a></li>')
						.attr('onclick','return false') //liDuanqiang modify
						.bind("click", getClickHandler(page_id))
						.attr('href', opts.link_to.replace(/__id__/,page_id));
						
						
				}
				/*if(appendopts.classes){
					lnk.addClass(appendopts.classes);
				}*/
				panel.append(lnk);
			};
			// Generate "Previous"-Link
			if(opts.prev_text && (current_page > 0 || opts.prev_show_always)){
				appendItem(current_page-1,{text:opts.prev_text, classes:"prev"});
			}
			// Generate starting points
			if (interval[0] > 0 && opts.num_edge_entries > 0)
			{
				var end = Math.min(opts.num_edge_entries, interval[0]);
				for(var i=0; i<end; i++) {
					appendItem(i);
				}
				if(opts.num_edge_entries < interval[0] && opts.ellipse_text)
				{
					//jQuery("<span>"+opts.ellipse_text+"</span>").appendTo(panel);
					jQuery("<li><span>"+opts.ellipse_text+"</span></li>").appendTo(panel);
				}
			}
			// Generate interval links
			for(var i=interval[0]; i<interval[1]; i++) {
				appendItem(i);
			}
			// Generate ending points
			if (interval[1] < np && opts.num_edge_entries > 0)
			{
				if(np-opts.num_edge_entries > interval[1]&& opts.ellipse_text)
				{
					//jQuery("<span>"+opts.ellipse_text+"</span>").appendTo(panel);
					jQuery("<li><span>"+opts.ellipse_text+"</span></li>").appendTo(panel);
				}
				var begin = Math.max(np-opts.num_edge_entries, interval[1]);
				for(var i=begin; i<np; i++) {
					appendItem(i);
				}
				
			}
			// Add Any Page Input Start (Jason Qin,2009-09-02)
			if(np > (opts.num_display_entries + opts.num_edge_entries)){
				//panel.append(
				//		jQuery('<input type="text">').keypress(function(evt){
				panel.append($('<li/>').append($('<span style="padding:0px"/>').append(
					jQuery('<input type="text" size="4" />').keypress(function(evt){
						var keyCode = evt.charCode || evt.which;
						if(keyCode == 13){//Enter to commit
							//Is empty
							if($.trim($(this).val()) == ''){
								return false;
							}
							//Is number
							if(!(/^\d+$/.test($(this).val()))){
								alert("请输入正确的页码格式");
								$(this).val("");
								return false;
							}
							//Is true page
							var inputPage = parseInt($(this).val() * 1);
							if(inputPage <= 0 || inputPage > numPages()){
								alert("请输入正确的页码范围.(1至"+numPages()+")");
								$(this).val("");
								return false;
							}
							//Do go page
							pageSelected(inputPage - 1, evt);
							return true;
						}
						//Is Backspace or Delete
						else if(keyCode == 0 || keyCode == 8){
							return true;
						}
						//Is not number input key
						if(keyCode < 48 || keyCode > 57){
							return false;
						}
						//Is true page input
						var inputPage = parseInt($(this).val() + (keyCode-48));
						if(inputPage > np||inputPage<=0){
							return false;
						}
						//Default return true
						return true;
					})
				)));
			}
			// Add Any Page Input End
			
			// Generate "Next"-Link
			if(opts.next_text && (current_page < np-1 || opts.next_show_always)){
				appendItem(current_page+1,{text:opts.next_text, classes:"next"});
			}
		}
		
		// Extract current_page from options
		var current_page = opts.current_page;
		// Create a sane value for maxentries and items_per_page
		maxentries = (!maxentries || maxentries < 0)?1:maxentries;
		opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0)?1:opts.items_per_page;
		// Store DOM element for easy access from all inner functions
		var panel = jQuery(this);
		// Attach control functions to the DOM element 
		this.selectPage = function(page_id){ pageSelected(page_id);};
		this.prevPage = function(){ 
			if (current_page > 0) {
				pageSelected(current_page - 1);
				return true;
			}
			else {
				return false;
			}
		};
		this.nextPage = function(){ 
			if(current_page < numPages()-1) {
				pageSelected(current_page+1);
				return true;
			}
			else {
				return false;
			}
		};
		// When all initialisation is done, draw the links
		drawLinks();
        // call callback function
		if(opts.renderPagebarBefore){
			opts.callback(current_page, this);
		}
	});
};


